CN109900415B - A kind of pressure pressure difference transmitter - Google Patents
A kind of pressure pressure difference transmitter Download PDFInfo
- Publication number
- CN109900415B CN109900415B CN201910231113.5A CN201910231113A CN109900415B CN 109900415 B CN109900415 B CN 109900415B CN 201910231113 A CN201910231113 A CN 201910231113A CN 109900415 B CN109900415 B CN 109900415B
- Authority
- CN
- China
- Prior art keywords
- pressure
- buffer spring
- dashpot
- isolation diaphragm
- sealing piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The present invention relates to sensor technical fields, and disclose a kind of pressure pressure difference transmitter, including pedestal and positive pressure isolation diaphragm, the end face of pedestal and be located at positive pressure isolation diaphragm inside be equipped with spike filter device, spike filter device includes dashpot, sealing piston, buffer spring, positioning tie bar and pressure part, and sealing piston pulling is located in dashpot by positioning tie bar under the compression elastic force effect of buffer spring.The present invention in the high-pressure chamber of pedestal by setting spike filter device; and the original state that buffer spring is pressurized is set as at the displacement limits generated when positive pressure isolation diaphragm reaches nominal pressure value; when system is by fluid spike or impulse action; pressure more than threshold value then preferentially can act on pressure part by positive pressure isolation diaphragm; sealing piston is driven to compress buffer spring; line pressure shift more than threshold value can then be buffered because silicone oil enters in dashpot, and effective protection center pressure-sensitive diaphragm and relevant capacitor are influenced from spike.
Description
Technical field
The present invention relates to sensor technical field, specially a kind of pressure pressure difference transmitter.
Background technique
Transmitter, that is, all energy outputting standard signal sensor, is to be worked based on negative-feedback principle, mainly by surveying
Amount part, amplifier and feedback fraction composition, are common detection devices in process control technique, convert by its pressure-signal
Mode can be divided into: resistance-strain chip pressure transmitter, diffused silicon pressure transmitter, ceramic pressure transmitter etc..Wherein, pressure
Transmitter shows that the transmitter of pressure detection value is also differential pressure transmitter with capacitance change.
As shown in Figure 1, center pressure-sensitive diaphragm 2 is measuring diaphragm, it is called movable electrode, the arc-shaped electrode 6 with two sides
Form two capacitor plates, negative pressure isolation diaphragm 3 and positive pressure isolation diaphragm 4 be respectively low-pressure chamber's isolation film and high-pressure chamber every
From film, center pressure-sensitive diaphragm 2 and negative pressure isolation diaphragm 3 and positive pressure isolation diaphragm 4 are respectively formed two chambers, interior equal filling silicon oil
5, the characteristics of silicone oil 5 is that compressive deformation is small, can perfect transmitting pressure deformation amount, when 4 side liquid pressure change of positive pressure isolation diaphragm
When, center pressure-sensitive diaphragm 2 can be made to be displaced to the small side of pressure, the pole plate spacing variation of two sides, forms differential electricity as a result,
Hold, the relative changing value of differential capacitor is directly proportional to by measuring pressure, and feedback control is carried out after amplifier circuit amplifies.
In process control procedure, the maximum pressure value parameter of frame of reference, in general, pressure are needed to the type selecting of transmitter
Power transmitter Pressure maximum value should reach 1.5 times of system maximum pressure value, and still, the fluids such as some hydraulic pressure have pressure spike
Or continuous pulse, these spikes may reach 5 times of " maximum " pressure even 10 times, continuous high-voltage pulse, approach or
Person is more than the maximum rated pressure of transmitter, can damage to measuring diaphragm or capacitor, can shorten the service life of transmitter,
To solve the above problems, first paid pinged the rated pressure for improving transmitter, but this measure can sacrifice the resolution ratio of transmitter,
Another way is then to weaken spike using buffer in systems, but this can reduce the response speed of sensor.For this purpose,
It is proposed a kind of pressure pressure difference transmitter, it is intended to solve the problems, such as fluid spike, when selecting transmitter, system performance and pick-up
A kind of preferred embodiment is provided between the device service life.
Summary of the invention
It is existing insufficient in use for the existing differential pressure transmitter proposed in background technique, the present invention provides
A kind of pressure pressure difference transmitter has the advantages of fluid spike safeguard function, solves mentioned above in the background art
Problem.
The invention provides the following technical scheme: a kind of pressure pressure difference transmitter, including pedestal and positive pressure isolation diaphragm, it is described
The end face of pedestal and be located at positive pressure isolation diaphragm inside be equipped with spike filter device, the spike filter device packet
Dashpot, sealing piston, buffer spring, positioning tie bar and pressure part are included, the dashpot is opened in the trough center of pedestal end face
Place, the internal slide of the dashpot is connected with the sealing piston that dashpot inner cavity is divided into two cavities in left and right, described close
The side of envelope piston is fixedly connected by buffer spring with the interior bottom of dashpot, and the side of the sealing piston is additionally provided with positioning and draws
Sealing piston pulling is located in dashpot by bar, the positioning tie bar under the compression elastic force effect of buffer spring, the sealing
The other side of piston is equipped with can be with positive pressure isolation diaphragm by the pressure part for being more than rated pressure effect and contacting.
Preferably, the buffer spring is in the rated pressure value that the initial value of elastic of pressured state is instrument.
Preferably, the pressure part uses light hollow material, and free end is disk, and the other side is spherical, ball
The curvature in shape face is identical as the wavy end face trough curvature of pedestal at the position.
Preferably, the positioning tie bar is the drawstring of tension tensioning, and the tensioning state of the positioning tie bar keeps pressure part
Motionless position is when positive pressure isolation diaphragm is acted on by rated pressure and pressure part contact position.
Preferably, the positioning tie bar can also be retracting cylinder.
The present invention have it is following the utility model has the advantages that
1, the present invention is in the high-pressure chamber of pedestal by setting spike filter device, and it is initial that buffer spring is pressurized
State is set as positive pressure isolation diaphragm and reaches at the displacement limits generated when nominal pressure value, thus, positive pressure isolation diaphragm by
When to normal pressure, because the elastic force of buffer spring acts on, sealing piston will not generate displacement, during line pressure shift is normally transmitted to by silicone oil
Heart pressure-sensitive diaphragm measures, and when system is by fluid spike or impulse action, the pressure more than threshold value then can preferentially pass through
Positive pressure isolation diaphragm act on pressure part, drive sealing piston compress buffer spring, more than threshold value line pressure shift then can because silicone oil into
Enter in dashpot and buffered, effective protection center pressure-sensitive diaphragm and relevant capacitor are influenced from spike.
2, the buffer spring of pressured state always can be fixed on of positioning tie bar by the setting of positioning tie bar by the present invention
Tight position, thus, ensure that buffer spring is in sealing piston always under the elastic force effect of system pressure maximum value, i.e. positioning tie bar
With the synergistic effect of buffer spring, may make when spike filter device works in system normally-pressured neighbor not by spike arteries and veins
It rushes filter device setting and influences resolution ratio, start response in time when system has spike, eliminating spike influences, and makes
The transmitter both can achieve optimal resolution ratio can also with center of serve pressure-sensitive diaphragm and its formed component service life
It is long-acting.
Detailed description of the invention
Fig. 1 is structure of the invention cross-sectional view；
Fig. 2 is partial enlargement diagram at the A of Fig. 1 of the present invention；
Fig. 3 is positioning tie bar of the present invention and sealing piston scheme of installation.
In figure: 1, pedestal；2, center pressure-sensitive diaphragm；3, negative pressure isolation diaphragm；4, positive pressure isolation diaphragm；5, silicone oil；6, arc
Shape electrode；7, spike filter device；71, dashpot；72, sealing piston；73, buffer spring；74, positioning tie bar；75, pressure-bearing
Part.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Please refer to Fig. 1-3, a kind of pressure pressure difference transmitter, the measurement portion including published capacitance differential pressure cell
Point, pedestal 1, center pressure-sensitive diaphragm 2, negative pressure isolation diaphragm 3, positive pressure isolation diaphragm 4, silicone oil 5 and arc-shaped electrode 6 are specifically included,
Two halves pedestal 1 is screwed up by four groups of bolts and forms sealed internal chamber together, and center pressure-sensitive diaphragm 2 is equipped in the middle part of the pedestal 1 of two sides,
The inside of pedestal 1 is embedded with glass seat, and glass seat inner wall is equipped with the arc-shaped electrode 6 of arc, arc-shaped electrode 6 and center pressure sensitive film
Piece 2 forms capacitor, and the two sides of pedestal 1 are respectively equipped with negative pressure isolation diaphragm 3 and positive pressure isolation diaphragm 4, negative pressure isolation diaphragm 3 and just
The junction of pressure isolation diaphragm 4 and pedestal 1 is to squeeze to seal by O-ring seal, center pressure-sensitive diaphragm 2 and negative pressure isolation film
Cavity between piece 3 and positive pressure isolation diaphragm 4 is filled with silicone oil 5, wherein 3 side of negative pressure isolation diaphragm is low pressure chamber, positive pressure
The side of isolation diaphragm 4 is high pressure chest, is equipped with spike filtering dress in the high-pressure side of above-mentioned existing capacitance differential pressure cell
7 are set, i.e., is equipped with spike filter device 7, the spike arteries and veins in the side of pedestal 1 and close to the position of positive pressure isolation diaphragm 4
Rushing filter device 7 includes dashpot 71, sealing piston 72, buffer spring 73, positioning tie bar 74 and pressure part 75, and dashpot 71 opens up
At the waveform low ebb center of 1 end face of pedestal, the internal slide of dashpot 71 is sealedly connected with sealing piston 72, sealing piston
By setting two layers of sealing ring and adherent oil sealing, the side of sealing piston 72 is interior by buffer spring 73 and dashpot 71 for 72 outside
Bottom is fixedly connected, meanwhile, ipsilateral in sealing piston 72 is equipped with positioning tie bar 74, and positioning tie bar 74 is in a non-operative state
Tensioning state is fixedly connected with pressure part 75 in the other side of sealing piston 72, and pressure part 75 is light material, pressure part 75
The scope of freedom is disk, and one side is spherical, and the curvature of curved surface is identical as the waveform curvature of 1 end face of pedestal.
By the way that moveable sealing piston 72 is arranged in high pressure chest, when equipment detects in the Fluid pressure normally set
When, because of the elasticity effect of buffer spring 73, the displacement of positive pressure isolation diaphragm 4 drives the displacement of silicone oil 5 that sealing piston 72 will not be made to send out
Raw displacement, thus ensured normal detection work of the detection device within the scope of rated pressure, and working as fluid in system has spike
More than after rated pressure, positive pressure isolation diaphragm 4 is contacted with pressure part 75 for pulse, and pressure part 75 is pushed to drive sealing piston 72
Move, compress buffer spring 73, to left dislocation sealing piston 72 to additional oil storage space is reserved in dashpot 71, make up because just
Pressure isolation diaphragm 4 is displaced the space for causing center pressure-sensitive diaphragm 2 and 4 cavity volume of positive pressure isolation diaphragm to reduce, thus, by buffering
Spring 73 buffer spike impact, meanwhile, because buffering displacement caused by oil storage cavity variable quantity storing up by dashpot 71
Oily cavity variable quantity is filled up, and transmits the superthreshold displacement of positive pressure isolation diaphragm 4 in complete be transmitted to so as to avoid silicone oil 5
On heart pressure-sensitive diaphragm 2, and then reach optimal buffer protection effect, neither influences the resolution ratio of transmitter, also do not reduce sensing
The response speed of device, it is possible to provide instrument is improved under the premise of a transmitter is both with two-way in terms of resolution ratio with response speed to be made
With the selection scheme in service life.
Wherein, buffer spring 73 is in pressured state always, and buffer spring 73 is in the initial value of elastic of pressured state and is
The rated pressure value of instrument, when this measure can ensure that instrument works within the scope of rated pressure value, fluid pressure value be not enough to by
Buffer spring 73 compresses, therefore sealing piston 72 unshifts, and positioning tie bar 74 is pressurized still in tensioning state, positive pressure isolation diaphragm 4
Displacement then passes to center pressure-sensitive diaphragm 2 by silicone oil 5, the detection of normal resolution standard is realized, when system reaches specified pressure
When force value, then positive pressure isolation diaphragm 4 contacts with pressure part 75 and sealing piston 72 is pushed to be displaced, and compresses buffer spring 73, Ji Nengbao
Barrier instrument normally detects work, and is able to achieve the buffer protection measure at spike moment.It should be noted that buffer spring 73 is right
The initial value setting of 72 elastic force of sealing piston is determined by pneumatics in buffer spring 73 compression deformation quantity itself and dashpot 71, if slow
Vacuum in jet-bedding 71, then the initial value of elastic is provided by 73 compression deformation of buffer spring completely, if there is a pneumatics (such as atmospheric pressure
By force), then the initial value of elastic is provided by 73 compression deformation of buffer spring and pneumatics power are comprehensive, and combined value is rated pressure value.
Wherein, positioning tie bar 74 is the drawstring of tension tensioning, and the tensioning state of positioning tie bar 74 keeps pressure part 75 motionless
Position be positive pressure isolation diaphragm 4 when being acted on by rated pressure with 75 contact position of pressure part, i.e., after system reaches maximum rating,
Pressure more than threshold value will pass to center pressure-sensitive diaphragm 2 prior to passing through silicone oil 5, act directly on pressure part 75, and by
Buffer spring 73 buffers, and center pressure-sensitive diaphragm 2 is timely protected in the spike stage.
Wherein, positioning tie bar 74 can be also flexible tubular.Rope form or flexible tubular for positioning tie bar 74, installation side
Formula is seen shown in Fig. 3, and one end of positioning tie bar 74 is fixed on to the interior bottom of dashpot 71, and the other end passes through sealing piston 72
Inside and fixation is pressed by bolt in end, thus can be easy to implement the installation of sealing piston 72, while thering is bolt to press and matching
It closes gasket seal and ensures its sealing performance.
Wherein, pressure part 75 uses light hollow material, and free end face is disk, is improved and positive pressure isolation diaphragm 4
Contact area, fluid spike pressure preferably can be transferred to sealing piston 72, the other end is spherical, and with pedestal 1
The wave face curvature of end face is identical, in order to which the displacement of pressure part 75 is not obstructed, light hollow material can reduce in silicone oil 5 because
Self weight leads to the periphery sealing ring bending moment of sealing piston 72, and deformation occurs, influences sealing performance, hollow aluminum specifically can be used
Outer plating stainless steel.
Wherein, spike filter device 7 need to be placed at the waveform low ebb center of 1 end face of pedestal, in general, positive pressure
Isolation diaphragm 4 can be contacted preferentially with the wave crest in waveform face, and the silicone oil 5 of cavity is gathered in each low ebb section, positive pressure isolation diaphragm 4
Continue the displacement that is pressurized, rated pressure value can be reached, therefore spike filter device 7 is placed at trough, it can be preferably stagnant
Property afterwards executes the protecting effect of instrument spike.
Working principle of the present invention is as follows:
Within the scope of rated pressure value, instrument works normally section, and positive pressure isolation diaphragm 4, which is pressurized, to be displaced, positive pressure isolation diaphragm 4
It is not contacted with pressure part 75, the pressure that the compression of silicone oil 5 is transferred to sealing piston 72 is less than buffer spring 73 to the bullet of sealing piston 72
Power, therefore sealing piston 72 is failure to actuate, the displacement of positive pressure isolation diaphragm 4 is completely transferred to center pressure-sensitive diaphragm 2 by silicone oil 5
On, realize the instrument detection resolution within the scope of rated pressure value；When fluid has spike in system, positive pressure isolation diaphragm
4, which are pressurized, is displaced, and positive pressure isolation diaphragm 4 is contacted with pressure part 75, and pressure part 75 is pushed to drive sealing piston 72 into dashpot 71
Bottom direction is mobile, compresses buffer spring 73, on the one hand, buffer spring 73 buffers the pressure of positive pressure isolation diaphragm 4, on the other hand, Xiang Huan
The mobile sealing piston 72 in bottom causes the cavity that can accommodate silicone oil 5 in dashpot 71 to increase in jet-bedding 71, and positive pressure isolation diaphragm 4
Shifting pushes silicone oil 5 to enter in dashpot 71 and temporarily stores, and displacement will not be passed to center pressure-sensitive diaphragm 2 by silicone oil 5, ensures
The safety of center pressure-sensitive diaphragm 2.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of pressure pressure difference transmitter, including pedestal (1) and positive pressure isolation diaphragm (4), it is characterised in that: the pedestal (1)
End face and be located at positive pressure isolation diaphragm (4) inside be equipped with spike filter device (7), the spike filter device
It (7) include dashpot (71), sealing piston (72), buffer spring (73), positioning tie bar (74) and pressure part (75), the dashpot
(71) it is opened at the trough center of pedestal (1) end face, the internal slide of the dashpot (71) is connected with dashpot (71)
Inner cavity is divided into the sealing piston (72) of two cavities in left and right, and the side of the sealing piston (72) passes through buffer spring (73) and slow
The interior bottom of jet-bedding (71) is fixedly connected, and the side of the sealing piston (72) is additionally provided with positioning tie bar (74), the positioning tie bar
(74) sealing piston (72) are held under the compression elastic force effect of buffer spring (73) and is located in dashpot (71), the sealing
The other side of piston (72) is equipped with positive pressure isolation diaphragm (4) by the pressure part (75) for being more than rated pressure effect and contacting.
2. a kind of pressure pressure difference transmitter according to claim 1, it is characterised in that: the buffer spring (73), which is in, to be pressurized
The initial value of elastic of state is the rated pressure value of instrument.
3. a kind of pressure pressure difference transmitter according to claim 1, it is characterised in that: the pressure part (75) uses lightweight
Hollow material, and free end is disk, the other side is spherical, the curvature of spherical and the pedestal at pressure part (75) position
(1) wavy end face trough curvature is identical.
4. a kind of pressure pressure difference transmitter according to claim 1, it is characterised in that: the positioning tie bar (74) is tension
The drawstring of tensioning, the position that the tensioning state of the positioning tie bar (74) keeps pressure part (75) motionless are positive pressure isolation diaphragm
(4) when being acted on by rated pressure and pressure part (75) contact position.
5. a kind of pressure pressure difference transmitter according to claim 1, it is characterised in that: the positioning tie bar (74) is flexible
Cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231113.5A CN109900415B (en) | 2019-03-26 | 2019-03-26 | A kind of pressure pressure difference transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910231113.5A CN109900415B (en) | 2019-03-26 | 2019-03-26 | A kind of pressure pressure difference transmitter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109900415A CN109900415A (en) | 2019-06-18 |
| CN109900415B true CN109900415B (en) | 2019-09-06 |
Family
ID=66953896
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910231113.5A Active CN109900415B (en) | 2019-03-26 | 2019-03-26 | A kind of pressure pressure difference transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109900415B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110220636B (en) * | 2019-07-05 | 2020-12-15 | 中国计量大学 | Capillary communicating pipe type differential pressure sensor and measuring method |
| CN111337182B (en) * | 2020-03-13 | 2021-09-14 | 浙江奥新仪表有限公司 | Wide-range high-precision pressure transmitter |
| CN112326094B (en) * | 2020-10-29 | 2022-02-18 | 陕西理工大学 | Pressure sensor and urine power detection device |
| CN114279622A (en) * | 2021-11-30 | 2022-04-05 | 浙江中控技术股份有限公司 | Differential pressure sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8309932D0 (en) * | 1982-04-16 | 1983-05-18 | Tokyo Shibaura Electric Co | Pressure transducer |
| WO1992017757A1 (en) * | 1991-04-05 | 1992-10-15 | Mark Iv Transducer Corporation | Differential pressure device |
| JPH07198519A (en) * | 1993-12-29 | 1995-08-01 | Yamatake Honeywell Co Ltd | Differential pressure/pressure originating device |
| CN202041345U (en) * | 2011-03-18 | 2011-11-16 | 上海洛丁森工业自动化设备有限公司 | Oneway overvoltage protection differential voltage sensor free of voltage loss in transferring |
| CN203132776U (en) * | 2013-03-12 | 2013-08-14 | 福建上润精密仪器有限公司 | High-overload-resistant structure protecting pressure/differential pressure transmitter |
| DE102014212766A1 (en) * | 2014-07-02 | 2015-01-29 | Siemens Aktiengesellschaft | Differential pressure transmitter with an overload protection system |
-
2019
- 2019-03-26 CN CN201910231113.5A patent/CN109900415B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8309932D0 (en) * | 1982-04-16 | 1983-05-18 | Tokyo Shibaura Electric Co | Pressure transducer |
| WO1992017757A1 (en) * | 1991-04-05 | 1992-10-15 | Mark Iv Transducer Corporation | Differential pressure device |
| JPH07198519A (en) * | 1993-12-29 | 1995-08-01 | Yamatake Honeywell Co Ltd | Differential pressure/pressure originating device |
| CN202041345U (en) * | 2011-03-18 | 2011-11-16 | 上海洛丁森工业自动化设备有限公司 | Oneway overvoltage protection differential voltage sensor free of voltage loss in transferring |
| CN203132776U (en) * | 2013-03-12 | 2013-08-14 | 福建上润精密仪器有限公司 | High-overload-resistant structure protecting pressure/differential pressure transmitter |
| DE102014212766A1 (en) * | 2014-07-02 | 2015-01-29 | Siemens Aktiengesellschaft | Differential pressure transmitter with an overload protection system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109900415A (en) | 2019-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109900415B (en) | A kind of pressure pressure difference transmitter | |
| CN110006583B (en) | Overload protection device for differential pressure transmitter | |
| CN101819052B (en) | Flow transmitter provided with double differential pressure sensors and pressure difference measurement method | |
| CN101339086A (en) | Pressure sensor possessing high pressure overload protection | |
| CN104913864A (en) | Silicon resonant pressure sensor structure capable of suppressing same frequency interference | |
| CN214467005U (en) | Self-protection water hammer eliminator | |
| CN110595665A (en) | Pressure detection sensor and detection method | |
| CN208805170U (en) | A kind of civil engineering fiber grating expansion joint test device | |
| CN202041345U (en) | Oneway overvoltage protection differential voltage sensor free of voltage loss in transferring | |
| CA2313313A1 (en) | Relative pressure sensor | |
| US11726019B2 (en) | Viscous damper fluid viscosity monitoring device and method based on piezoceramic transducers | |
| CN112161740A (en) | Pressure differential transmitter | |
| CN110261895B (en) | All-fiber microseismic monitoring system with high sensitivity and wide frequency response | |
| CN205504326U (en) | Hydraulic cushion system - structure for instrument | |
| CN205545151U (en) | Plane deformation measuring photovoltaic module surface loading test device | |
| CN108843639B (en) | Piezoelectric ceramic type jet pipe valve group | |
| CN108049307B (en) | Combined intelligent spherical force measuring support system | |
| CN108332822B (en) | Water level probe, system and method for interference type optical fiber water level monitoring system | |
| CN213148152U (en) | Overload-proof pressure transmitter | |
| CN210571137U (en) | Pressure detection sensor | |
| CN111910693A (en) | Method and device for monitoring leakage of sealing belt between pipe joints of immersed tunnel | |
| CN220018802U (en) | Double-layer protection type digital display pressure gauge | |
| CN201013355Y (en) | High temperature high-pressure hydraulic type automatic balancing arrangement | |
| CN201462130U (en) | Shield valve for protecting pressure gauge | |
| CN220568359U (en) | Overhead natural gas pipeline leakage detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |